1N5817 schottky
Bookmark this page:
 Yahoo!
 Google
 Windows Live
 del.icio.us
 digg
 Netscape
|
|
||||||||||||||||||||||
|
Posted by John on September 19, 2008, 12:22 pm
Please log in for more thread options Hello, I'm about to make a wideband rf sniffer using an op amp and a simple detector front end feeding a capacitor and one of the inputs to the op amp. I could bias the diode near conduction if it will help. I have to hand a 1n5817 schottky diode which is claimed to have a low forward voltage drop. While it's not exactly a signal diode will it do the job? Our local electronics store (Maplins UK) is fairly crummy when it comes to range of semiconductors. I could get a bat43, how about one of those? Any advice much appreciated. Thanks. | ||||||||||||||||||||||
|
Posted by John Popelish on September 19, 2008, 12:34 pm
Please log in for more thread options John wrote: At low current, it is going to just act like a pretty big capacitor. About 250 pF. See figure 4 on: http://www.diodes.com/datasheets/ds23001.pdf Ask for a 1N5711. http://www.st.com/stonline/books/pdf/docs/3238.pdf -- Regards, John Popelish | ||||||||||||||||||||||
|
Posted by John on September 19, 2008, 4:47 pm
Please log in for more thread options
On Fri, 19 Sep 2008 12:34:39 -0400, John Popelish wrote: > John wrote:
>> Hello,
>> >> I'm about to make a wideband rf sniffer using an op amp and a simple >> detector front end feeding a capacitor and one of the inputs to the op >> amp. I could bias the diode near conduction if it will help. >> >> I have to hand a 1n5817 schottky diode which is claimed to have a low >> forward voltage drop. While it's not exactly a signal diode will it do >> the job? Our local electronics store (Maplins UK) is fairly crummy when >> it comes to range of semiconductors. I could get a bat43, how about one >> of those? >
> At low current, it is going to just act like a pretty big capacitor. > About 250 pF. See figure 4 on: > http://www.diodes.com/datasheets/ds23001.pdf > > Ask for a 1N5711. > http://www.st.com/stonline/books/pdf/docs/3238.pdf Yeah, thanks. | ||||||||||||||||||||||
|
Posted by on September 19, 2008, 3:27 pm
Please log in for more thread options
> Hello,
p.
> > I'm about to make a wideband rf sniffer using an op amp and a simple > detector front end feeding a capacitor and one of the inputs to the op am= > I could bias the diode near conduction if it will help.
e
> > I have to hand a 1n5817 schottky diode which is claimed to have a low > forward voltage drop. While it's not exactly a signal diode will it do th= > job? Our local electronics store (Maplins UK) is fairly crummy when it
> comes to range of semiconductors. I could get a bat43, how about one of > those? > > Any advice much appreciated. > > Thanks. "> I'm about to make a wideband rf sniffer using an op amp "
What RF frequencies are you looking for? What OPamp are you using. Your typical opamp is not going to work at RF frequencies (10 - 100 MHz.) Minicircuits makes some nice RF amplifiers that might work for you... these cost a bit more than op-amps but for $60-$100 you can do alright. George | ||||||||||||||||||||||
|
Posted by John on September 19, 2008, 4:50 pm
Please log in for more thread options
On Fri, 19 Sep 2008 12:27:42 -0700, ggherold wrote: >> Hello,
>> >> I'm about to make a wideband rf sniffer using an op amp and a simple >> detector front end feeding a capacitor and one of the inputs to the op >> amp. I could bias the diode near conduction if it will help. >> >> I have to hand a 1n5817 schottky diode which is claimed to have a low >> forward voltage drop. While it's not exactly a signal diode will it do >> the job? Our local electronics store (Maplins UK) is fairly crummy when >> it comes to range of semiconductors. I could get a bat43, how about one >> of those? >> >> Any advice much appreciated. >> >> Thanks. >
> "> I'm about to make a wideband rf sniffer using an op amp " > > What RF frequencies are you looking for? What OPamp are you using. Your > typical opamp is not going to work at RF frequencies (10 - 100 MHz.) > Minicircuits makes some nice RF amplifiers that might work for you... > these cost a bit more than op-amps but for $60-$100 you can do alright. > George I can use any op amp within reason. The input to the op amp will be dc. I want as wide a rf (Hz) range as is possible. Anyhow I think it's sorted now. Thanks for your help. | ||||||||||||||||||||||
| Similar Threads | Posted |
| 1N5817 schottky | September 19, 2008, 12:22 pm |
| schottky tempco | May 29, 2006, 9:15 am |
| schottky tempco | December 12, 2007, 4:23 pm |
| Re: schottky tempco | December 14, 2007, 3:02 pm |
| SiGe Microwave Schottky Diodes | April 4, 2006, 8:04 pm |
>
> I'm about to make a wideband rf sniffer using an op amp and a simple
> detector front end feeding a capacitor and one of the inputs to the op amp.
> I could bias the diode near conduction if it will help.
>
> I have to hand a 1n5817 schottky diode which is claimed to have a low
> forward voltage drop. While it's not exactly a signal diode will it do the
> job? Our local electronics store (Maplins UK) is fairly crummy when it
> comes to range of semiconductors. I could get a bat43, how about one of
> those?